Thank you for the reply, but these are refugees crossing into Canada. Not American citizens entering the United States. I don't see thousands of results either.

A quick google search revealed absolutely nothing fruitful - 3 articles about the refugees seeking asylum in Canada being deported after CP discovery, 1 American citizen charged with CP found in his residence, 1 American citizen charged by a Saskatchewan provincial court, and 1 former Border Patrol agent caught as part of a Texan initiative that counters crimes against children.

Not a single example comes to mind of an American citizen entering or leaving with illegal electronic information. If these searches were actually doing anything useful, I'm sure an organized effort to promote its success would've been underway.